What Nikon should do , to heat rid of the depth of field problem are:
Change to a new LED , better lens f stop , at least 5.6 .
They prefer a cool scan, low light, low energy ,no heat.
Imacon and other scanner manufactures prefer a more intensive light source
and a fan to stable the scanner heat inside. In the new Imacon they have
build in a thermostat set at 20 Celsius ,
despite what conditions it is outside in the room. The Imacon scanner lens
works at f stop 8 .
Mr Hemmingway at Polaroid maybe can answer what is the lens f stop in a
>From: Julian Robinson <email@example.com>
>Subject: Re: filmscanners: Canon 4000 scanner VS Nikon LS4000
>Date: Wed, 21 Nov 2001 11:43:41 +1100
>>At 9:44 AM -0500 20-11-01, Bruce Kinch wrote:
>>>Perhaps it's worth noting that Kodak now provides "curved field"
>>>projection lenses as standard for normal (cardboard, presumably) mounted
>>>slides in their Carousel projectors, but their older "flat field" design
>>>is recommended for glass mounted transparencies.
>>BF: If memory serves correctly this has been the case at least since the
>>1970's. Curved field lenses were standard, and flat field lenses were
>YES! I have wondered why Nikon don't do the same thing within the range of
>their scanner Depth of Field. It would nearly double warping that could be
>tolerated before losing focus. The only downside is that you would have to
>put the film/slide in the "right way round" regarding film curve, not
>regarding mirror image sense. This would not be a problem if documented
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